Is it reasonable to buy a 2004 X5 with ~80k miles, with a broken AC compressor?

What is your question?

I'm considering buying a used 2004 X5 with 80k miles on it. It's priced about $3k below KBB because the A/C compressor is out and needs to be replaced. It has been out for about a year without being fixed. Is it reasonable to buy a car like this, and if I do, should I expect lots of trouble down the road?